Firefighters inspect the scene of an early-morning gas station fire in Fort Collins on Monday morning. / Trevor Hughes/The Coloradoan

A fire at the Valero gas station near Colorado State University caused about $125,000 in damage, and its origin remains undetermined as the investigation continues, officials said Tuesday.

The two-alarm fire was reported at 5:21 a.m. Monday, as flames and smoke were coming out of the northwest part of the building on 1501 W. Elizabeth St. The gas station was closed at the time, and nobody was hurt.

Crews had the fire under control in about 15 minutes. The fire is “suspicious,” and investigators are working with police to find its origin and cause, according to a Poudre Fire Authority report Monday.